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| -rw-r--r-- | txr.1 | 23 |
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@@ -30454,6 +30454,29 @@ These error symbols existed: and .codn process_error . +.coNP Variables @ *txr-version* and @ *lib-version* +.desc +The +.code *txr-version* +variable gives the version of the \*(TX executable. Programs can express +conditional variable based on detecting the version. + +The +.code *lib-version* +variable gives the version of the installed library of \*(TX code accompanying +the executable. + +It is expected that these two variables have an identical value. Any +discrepancy in their value indicates an installation whose library or \*(TX +executable were upgraded independently. Should such a situation arise in any +system and cause a problem, \*(TX programs can be defensively coded against it +with the help of these variables. + +Some features of the \*(TX library are built into the executable, whereas +others are in the library directory. This aspect of library symbols isn't +specified in this manual; knowing which of these two variables is relevant +to a library feature requires familiarity with the implementation. + .SH* Appendix .SS* A. NOTES ON EXOTIC REGULAR EXPRESSIONS Users familiar with regular expressions may not be familiar with the complement |